Perhaps you should try some spelling variations:
"difusion del estudio" » "difusion de estudio", "difusion el estudio", "difusion al estudio"
"difusion mal estudios" » "difusion a estudios", "difusion el estudios", "difusion maria estudios", "difusion leal estudios", "difusion car estudios", "difusion mal estudio", "difusion ma estudios", "difusion mleal estudios"
"difusion al estudios" » "difusion a estudios", "difusion el estudios", "difusion de estudios", "difusion al estudio", "difusion leal estudios"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("difusion del estudio") or ((("difusion al estudios") or ("difusion mal estudios"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("difusion del estudio") OR ((("difusion al estudios") OR ("difusion mal estudios")))).
• Removing quotes may allow a broader search: (( difusion del estudio ) or ((( difusion al estudios ) or ( difusion mal estudios )))).
• Adding a wildcard symbol may retrieve word variants: (("difusion del estudio") or ((("difusion al estudios") or ("difusion mal estudios"))))*.